They don't.
The developers of the Linux kernel are volunteers. The Linux Foundation sponsors these developers so they can be independent.
Red Hat Enterprise Linux - produced by Red Hat SUSE Linux Enterprise Server - produced by Novell Ubuntu (available free of charge, but has paid support available) - produced by Canonical.
Linux Kernel Developers Summit was created in 2001.
The users and developers.
Linux Mint is developed and maintained by a small team of developers, namely Clem Lefevbre. You can view the list of developers at the link below.
AutoCAD is not developed for Linux. Some versions will run in Wine, but most recent versions will not.
Distributions
"Distros", or distributions.
No.
Some versions of CorelDRAW can be run on Linux using Wine, while others can't.
For older versions it is "/etc/lilo.conf" and for newer versions "/boot/grub/grub.cfg".
Not all version of Redhat Linux is free but you can download many desktop versions free.